@media (-webkit-min-device-pixel-ratio 1.5), (min-device-pixel-ratio 1.5)
  .border-1px
    &:before
      -webkit-transform scaleY(0.7)
      transform scaleY(0.7)
    &:after
      -webkit-transform scaleY(0.7)
      transform scaleY(0.7)
@media (-webkit-min-device-pixel-ratio 2), (min-device-pixel-ratio 2)
  // DPR为2的缩放0.5倍
  .border-1px
    &:before
      -webkit-transform scaleY(0.5)
      transform scaleY(0.5)
    &:after
      -webkit-transform scaleY(0.5)
      transform scaleY(0.5)